Delayed fluorescence as an indicator of the influence of the herbicides Irgarol 1051 and Diuron on hard coral Acropora digitifera

We examined the effect of two herbicides (Irgarol 1051 and Diuron) on symbiotic dinoflagellates in the hard coral Acropora digitifera using delayed fluorescence (DF), specifically assessing changes in molecular membrane transport, i.e. inflow and outflow rates, and the binding of the herbicides to t...

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Bibliographic Details
Published inMarine pollution bulletin Vol. 124; no. 2; pp. 687 - 693
Main Authors Katsumata, Masakazu, Takeuchi, Ichiro
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 30.11.2017
Elsevier BV
Subjects
Acropora
Acropora digitifera
Animals
Anthozoa - drug effects
Anthozoa - physiology
Corals
Delayed fluorescence
Dinoflagellates
Dinoflagellida - drug effects
Dinoflagellida - physiology
Diuron
Diuron - toxicity
Environmental Exposure
Environmental Monitoring - methods
Exposure
Fluorescence
Herbicides
Herbicides - toxicity
Impact analysis
Inflow
Inhibition
Irgarol 1051
Outflow
Photosynthesis
Photosystem II
Proteins
Pyrrophycophyta
Studies
Symbionts
Symbiosis - drug effects
Symbiotic dinoflagellates
Triazines - toxicity
Water Pollutants, Chemical - toxicity
Diuron
Acropora
Delayed fluorescence
Symbiotic dinoflagellates
Irgarol 1051
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Summary:We examined the effect of two herbicides (Irgarol 1051 and Diuron) on symbiotic dinoflagellates in the hard coral Acropora digitifera using delayed fluorescence (DF), specifically assessing changes in molecular membrane transport, i.e. inflow and outflow rates, and the binding of the herbicides to target proteins in photosystem II. The DF approach is rapid (e.g. measurement time, 60 s) and non-invasive, and can provide data on the extent of a photosynthetic system and the activity of its electron carriers. The DF of A. digitifera is inhibited 2 h after exposure to 1 μg/L of either Irgarol or Diuron. Analysis of DF inhibition over time by a compartment model suggests that Irgarol exposure results in a relatively higher inflow rate and lower outflow rate than does Diuron exposure. This suggests that Irgarol exposure more strongly inhibits photosynthesis and that the coral symbiotic dinoflagellates recover less from inhibition.
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ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2017.08.006